自定义GroupBox

public partial class mGroupBox : GroupBox
    {
        private Color _TitleBackColor = Color.Black;
        private Font _TitleFont = new Font("微软雅黑", 9F, FontStyle.Bold);
        private Color _TitleForeColor = Color.FromArgb(23, 169, 254);

        [Description("标题栏背景颜色"), Category("外观")]
        public Color TitleBackColor
        {
            get { return _TitleBackColor; }
            set
            {
                _TitleBackColor = value;
                Invalidate();
            }
        }

        [Description("标题栏文字颜色"), Category("外观")]
        public Color TitleForeColor
        {
            get { return _TitleForeColor; }
            set
            {
                _TitleForeColor = value;
                Invalidate();
            }
        }

        [Description("标题栏文字样式"), Category("外观")]
        public Font TitleFont
        {
            get { return _TitleFont; }
            set
            {
                _TitleFont = value;
                Invalidate();
            }
        }

        //重绘
        protected override void OnPaint(PaintEventArgs e)
        {
            int FontH = _TitleFont.Height + 2;
            //绘制填充
            var titleSoild = new SolidBrush(_TitleBackColor);
            e.Graphics.FillRectangle(titleSoild, 0, 0, Width, FontH);
            var bodySolid = new SolidBrush(BackColor);
            e.Graphics.FillRectangle(bodySolid, 1, FontH, Width, Height);
            //绘制标题文字
            var titleTextSoild = new SolidBrush(_TitleForeColor);
            e.Graphics.DrawString(Text, _TitleFont, titleTextSoild, 5, 1);
        }
    }